Pipe threading machine



Oct. 27, 1931.

E. W. BLANCHARD PIPE THREADING MACHINE Filed May 29, 1950 INVENTOR ,i fiUNi'rElD fisr..AJP-:i3sv

Patented Oct. 27, 1931 jsi Aira-'Nr omer D S. BOV/TIERS, OF TULSA, OKLAHOMA PIPE l THREADING MACH'INE Application filed May 29,

'-lvly inveiitioii'rel-ates vto the process of rchainiieing the end of a pipe nipple in a Y pipe threadingiinachine and means or'chamfering one end of the nipplev While the other 4end is heilig threaded insaid machine, and has for itsobject the rednctionfot machining' operations and consequent reduction in f the costV of making pipe nipples.

A further object of my invention is to pro- -videsuch means inform-adapted to `be attached to the-present well known type oi' pipe threading machines having a 'revolvably Y Vmounted drum or barrel bearing-'a chuck or chucks which hold'the threaded. l

With the above statediand other objects in viewwvhich" will appear as the description proceeds, myinventien consists iii the'novel v'featureshereinafter set vforth iii detail, i1-

lustrated iii-the accompanying drawings` and nrore'particularly pointed 'ont in the appeiii.-

Referriiigto-the drawings, in which nii-` 'inerals of likeV character 'y designate `similar parts 'th'riiont the several views:

Y l isa longitudinal cross-sectional View @ofthe conventional type of pipe threading machine, showing only'the important parts "thereof with reference tomy'inveiitioii, and

showing my` invention thereon in piaci-55a d showing a pipe nipple in the machinev: h onerend thereof beinel chamfered while the otherend isbeing threaded.

Fig. 2 is a rear view of a forked member ot'V my invention which prevents the bar which holds the chamferiiig bit from turning with the barrel of Vthe machine.

Fig. 3 is a rear View of one of the levers used to engage and disengage the chainiter ing bit. Y

Fig. 4, comprising A, B, C, D, and E, is a view lot part-s of my invention, being Vof the bar holding the chamfering bit, and clamps therefor, and of the bit itself.

Fig. 5, comprising F, G, and H, a view i holding the aforesaid bar in drum or barrel of the machine.

In the drawings, l represents the frame of the machine, with part cut away as indicated.

place in the ner and having thi threadingthe pipe. 4 represents a drum or P'Pewhile it is being vthreading machine.

Viarts of my invention, being of the means "1930.v sei'iai no. 457,171.

'2 represents the threading die head niovabl y mounted on "the machine' in the usual maii- 'eading dies 3 thereon for barrel openat both ends and which terminates in clniclrs 5 at each end, and with said -ehiicls having jaws 6 to hold the pipe to be vthreaded in the machine.

The drum 4 is Vrevolvably mounted on the frame l and has `itsbearings thereon as indicated at 7, and revolvedin the usual manner, not shown. All Lof the above parts'are of the well known type of pipe threading machine. Both chucks useri when the pipe `is too longtobe held by `one clinch alone, but` in thread ing' pipe nipples only the front chuck neigt Ato the threading dies, is used as shown in the drawings.

To'prepare the ends of the pipe nipples lfor threading, and to smooth the ends of the pipeand theinside of the pipe at thev ends,

`*it isnecessary to chamfer the pipe at the ends. 4Heretofore this has been done as a separate 'process and in a separate machine, prior to putting the nipples in the threading machine to be threaded, where they are then threaded, one'end vat a time, in said machine.

I have provided on such a machine, means of chamfering the ends of a pipe nipple, lchamfering one end and then turning the nip-'ple'en'd for end and chamfering the other "end while at the Sametime threading the end first chainierefl, and then turning the nipple end for end and threading the end last chamfered; or chamfering one end only of the nipple prior to putting'the nipple in the machine, and chamiering the other end of the nipple while at the same time threading the-end previously chamfered, then turning the nipple while at the same time threading end which has been chamfered in theplpe T he process or' so making pipe nipples is new as is of course the means therefor, and results in a saving of time in manufacturing the nipples.

The means for so doing are attached to the machine abovedescribed, and set up therein as follows.V In'the barrel 4f I have provided to the rear of the troiit'chuck in which the pipe nipple is held and on the opposite side l thereof from the die head, a chamfering bit 9 held-in a clamp 10 by set screws as indicated, on a round bar 11.VV The bar 11 is held in a housing 12 inserted in the drum-4 and held therein by the rear chuck ofthe machine and byra spider 13. The housing 12 is held centered in said drum by means of the jaws kof the rear chuck and by means of the set screws 14'on said spider. The bar 11 is inserted into the housing V12, and'for diiierf lent length oi' nipples, a bar land housing of different length is used when the variation in length of the nipples make it impossible to adjust the die head the vproper distance to permit of the insertion of the nipple andthe threading'rand chainfering thereof between the threading dies and the chamfering bit.

Y rIhe housing 12 revolves with they drum 4,

but the bar 11 therein is stationary with ref-l erenceto such revolution. The bar 11 is provided'with a iiat surface as at 29, being cut `awaygon bothA sides as shown. inthe endview` thereof at of Fig. 4, and the tlatportion ,thereof is slidabiy mounted in Va fork 15 on a bracket 16 ailiXed to said machine. The bar -11 isi'reeto move in the fork 15 longitudinallyl voii the druin L1in which it is axially positioned, Y ibut is prevented from revolving.

- At the rear end of the bar 11 isprovided a Yloose connection between the bar 11 and a le- Y ver 17, said Vconnection being a bolt 18 and nut 19 on said bar and atork 2O onsaid lever'. The lever has a stationary fulcruin point 21 on a forked stationary member 22 attached to the. bracket 16. j The lever 17 is thus 'free tof oscillate the bar 11 longitudinally of the-drum a4, to-engage and disengagefthe chamiering bit t 9 withand Afrom a nipple held in said machine.

' Onthe bar 1.1 and between the lever 17 on the Vlatface of its fork 20, and between the flat face of the stationary fork; 15, is located a compression coil spring 23, which compresses whenthe bar is thrown forward andwhich throws theV bar back when the lever 17 isreleased, thus engaging and `disengaging the chamering bit' as aforesaid. Y The powerpoint of the lever 17 is provided with a roller bearing or roll-ers 24 which bear on the inclined Vplane-or lsurfacel 25 of a foot lever 26, saidv inclined plane being the variable weight bearpoint of said'foot lever which said lever has its tu'lcrum point 27 stationary andhas l its powerpoint or end 28 conveniently located4V VLwith' reference to the machine to permit the operator of the machine to step on vthe :toot

leverat'its end, whichcauses the rollers 24 to travel on the inclined plane'25 and to throw 1 thetork'2Q forward, Aandthus to cause the bar 11 to'move forward and'to lthereby cause the y chainfering bit 9 to engage the end of a nipple 'fheld inV the machine. Wheny the Vchainiering operationhas been completed, the operator removes his ,weight from the foot lever l26,

releases'the chamfering bit 9 fromcontact with the nipple. y

It is obvious that the arrangement of levers employed to hold and reciprocate the bar 11 and to` center it with the drum and keep it stationary therein, is merely one of aiiumber of practical Ameans for doing so, and I do not 'desire tok be limited to the particular means shown in the drawings.' Y l Having thus fully disclosed my invention and the process involved, what I claim and desire to secure by Letters'Patent is t "1.The combination of a pipe threading .machine adapted to thread pipe nipples, consisting of a revolvably mounted barrel having a chuck thereon for holding a pipe nipple to be threaded by said machine; a threading die adapted to engage and threadsaid nipple while the same is chucked in said machine; a clianiilering bit located in said barrel and positioned at the opposite Vside of said chuck iromwhere said ,threading die fis. located,

and held stationary with referenceY to the revolution or said barrel; and means for moving saidchamfering bit longitudinal of said", barrel to vcausefsaid chamfering bit to engage vand held fromrevolving with said barrel;

means for-moving said chamtering bit longitudinally of said barrel-to cause said chaintering bit to be advanced and withdrawn in and from contact with the end oiia pipe nipple held in saidchuck; and means of attaching said V apparatus to said pipe-.threading niachine. Y v

In testimony whereof I aiiiX my signature.

EUGENEV. BLANCHARD.

l Aand thespring23throws bar andM .Y ,l 

